New Living Translation
“When you make a vow to the LORD your God, be prompt in fulfilling whatever you promised him. For the LORD your God demands that you promptly fulfill all your vows, or you will be guilty of sin.

American Standard Version
When thou shalt vow a vow unto Jehovah thy God, thou shalt not be slack to pay it: for Jehovah thy God will surely require it of thee; and it would be sin in thee.

Berean Study Bible
If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.

Douay-Rheims Bible
When thou hast made a vow to the Lord thy God, thou shalt not delay to pay it: because the Lord thy God will require it. And if thou delay, it shall be imputed to thee for a sin.

English Revised Version
When thou shalt vow a vow unto the LORD thy God, thou shalt not be slack to pay it: for the LORD thy God will surely require it of thee; and it would be sin in thee.

King James Bible
When thou shalt vow a vow unto the LORD thy God, thou shalt not slack to pay it: for the LORD thy God will surely require it of thee; and it would be sin in thee.

World English Bible
When you shall vow a vow to Yahweh your God, you shall not be slack to pay it: for Yahweh your God will surely require it of you; and it would be sin in you.

Young's Literal Translation
'When thou vowest a vow to Jehovah thy God, thou dost not delay to complete it; for Jehovah thy God doth certainly require it from thee, and it hath been in thee -- sin.

Deuteronomy 23:21 Additional Translations ...